flopped set - but does he have hearts

[NNH]

Stars $25 6-max

I've been at the table for a few orbits. Haven't gotten into any big hands yet. Showed down a small bluff one time. I have seen villain playing some questionable hands, and has built up his stack making thin calls against short stacks with TPWK. At the end of the session he was 40% VP$IP.

Villain has $75, I have $25.

Villain opens for .75 from MP. All fold to me I call in the SB with black QQ. Pot: $1.75

Flop is QK2 all hearts. I bet out $1. Villain raises to $3.50. I make it $10. He thinks for a bit and pushes. Now what?

Thoughts on my PF and flop play.

Thanks.